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The sulfite ion has a valency of 2.
You don't say that. What you do say is that the valency of sulphur in sulphur trioxide is 6.
Silicate radical is( SiO4) and its valency is -4
sodium thiosulphate
The valency of sulfur is 2.
Things are complicated if we use the term valency. It is better to use the term Oxidation state or Oxidation Number. In SO2, the oxidation state of sulphur is +4 and In SO3, the oxidation state of sulphur is +6.
+2
2
Sulphur
2-
Bicarbonate HCO3- is -1 charge. It has a valency of 1.
The chemical symbol for ammonium is NH4, and it has a valency of 1. Remember ammonium is a radical.